James baldwin



(No Model.)

J. BALDWIN.

LIPTING JACK.

N0. 386,954. Patented July 31, 1888.

Wrzesa as aan/ W,

N. PETERS, Pholo-Lilhogrmphnr. Wnhingmn. D. C.

UNITED STATES PATENT QEFICE.

JAMES BALD\VIN, OF NE\V YORK, I. Y.

LiFTlNG-JACK.

SPECIFICATION forming part of Letters Patent No. 386,954, dated July 3],1888.

(No model.)

To all whom, it may concern:

Be it known that I, J AMES BALDWIN, of the city and county of New York,in the State of New York, have invented a new and useful Improvement inLiftingJacks, of which the following is a specification.

My invention relates particularly to the class of lifting-jacks whichare commonly termed wagon-jacks, and are employed for raisingwagon-axles,so as to provide for readily greasing or oiling the axlearms on which the wheels rotate. Like other jacks of ,this character, myjack comprises a stand and a lifting-bar sliding therein, and providedor formed with a rack of ratchet-teeth. An operating-lever is pivoted inthe stand, and a pivoted pawl is connected with this lever for operationthereby. A stop-pawl is also employed for holding the lifting-bar in itselevated position while the lever and lifting-pawl are returning to takea new hold upon the rack.

In my improved jack the lifting-pawl is pivoted to the lever in rear ofthe main pivot on which the lever swings, and the pawl has a bearingupon this lever-pivot when operated by the downward movement ofthelever. The pawl may have in it a slot, which receives through it thelever-pivot, and which permits the pawl to move upward and downwardrelatively to the lever-pivot as the pawl is operated through itspivotal attachment with the lever at a point in rear of the lever-pivot.

The invention consists in novel combinations of parts, hereinafterdescribed, and pointed out in the claims, and which embrace the novelfeatures of construction above referred to.

In the accompanying drawings, Figure l is a partly-sectional elevationof a jack embody ing my invention, showing the parts in the positionwhich they occupy at the completion of the operative movement of thepawl and lever. Fig. 2 is a sectional view of a part of the stand andlifting-bar, together with the pawls and a portion of theoperating-lever, showing such lever as swung upward and the point of thepawl as just escaping from the teeth of the rack; and Fig. 3 is asection similar to Fig. 2, but showing the pawl as having escaped fromthe rack-tooth and as ready to perform a second operative movement.

Similar letters of reference designate corresponding parts in theseveral figures.

A designates the stand, which has a sufiiciently broad base to supportthe jack, and a central cavity or bore, a, extending through the wholeor the principal part of its height. "Within the stand A slides aliftingbar, I which may have a forked top piece, I), to embrace awagon-axle and prevent the upper end of the lifting-bar from slippingoff the axle in a lateral direction. Thislifting-bar B isformed orprovided with a rack, 13, of ratchet-teeth, and with this rack engage alifting-pawl, O, and a stop-pawl, D. l have also shown an op eratinglever or handle, E, which is pivoted by a pin or pivot, 0, between lugsor cars a, projecting from the stand, and this lever E may be swungupward and downward upon the pivot e as on a fulcrum.

The pawl C is connected with thelever E at a point behind the pivot c byapivot, c, and it will be understood that as theleverE is swung upwardand downward the point 0 will be raised and lowered relatively to thelever-pivot e. I have here represented the pawl Cashaving an elongatedopening or slot, 0, which receives through it the lever-pivot c, andwhich permits the pawl to swing upward and downward upon its own pivot,c, and relatively to the pivot 19.

As represented in Fig. 1, the pawl O is shown in operative position asraising the rack B and the lifting-bar B, and in this position it bearsupon the lever-pivot c. In the downward movement of the lever E thepivot c is moved downward, and as the pivot-pin 6 constitutes a fulcrumfor the pawl O, owing to its bearing thereon, the toothedend of the pawlis raised and imparts a lifting motion to the bar B until the toothedend of the pawl comes against the stop-pin f. When this occurs,the leverE is swung upward, and as the pawl G bears upon the inclined face of oneof the teeth it is lifted while the lifting-bar B settles back upon thestop-pawl D, which has no connection with the lever E. As this liftingmovement of the lever is continued, the pawl G is raised until the slot0 is mostly above the pivot e, as shown in Fig. 2, whereupon the pawlslips off the tooth of the rack B and into the position shown in Fig. 3.The lever ICO LII

E is now swung downward again, and the pawl engages with a new tooth ofthe rack, and at the same time,owing to its bearing upon the pin orpivot e, which forms a fulcrum for the pawl, the pawl is lifted by thedownward movement of the pivotal point e behind the ing-lever onopposite sides of its pivot; but

neither of these pawls has a bearing forward of its pivot on thelever-pivot when it is operated by a downward movementof thelever.

I am also aware of patent to Joyce, No. 172,924, dated February 1, 1876,and patent to Thurston, No. 176, 900, granted May 2, 1876, and do notdesire to include in my invention either'of the constructions shown inthese patents. Neither of these patents shows a pawl which is pivoted tothe lever in rear of the pivot on which the lever swings, and which hasa bearing on the lever-pivot when operated by the downward movement ofsaid lever. The first of these patentsshowsapawl which is supported by aknuckle-joint in front of the lever-pivot and between it and thelifting-bar. The second of these patents shows a sliding pawl, andneither'of the pawls shown in the two patents has a bearing upon thepivot of the lever.

What I claim as my invention, and desire to secure by Letters Patent,is-

l. The combination, with a stand and a ratchet-toothed lifting-barsliding therein, of

a lever pivoted in the stand and a pawl pivoted to the lever in rear ofthe pivot on which the lever swings, and having a bearing on thelever-pivot when operated by the downward movement of said lever, and astop-pawl pivoted in the stand independent of said lever and engagingsaid bar, substantially as herein described.

2. The combination, with the stand A and the toothed lifting-bar B, ofthe lever E, pivoted at e, the lifting-pawl O, slotted at c, to receivethe lever-pivot through it and pivoted to the lever behind theleverpivot, and the stop-pawl D, substantially as herein described.

JAMES BALD WIN.

Witnesses:

FREDK. HAYNES, HENRY J. MCBRIDE.

